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ndb/dns: provide v4 argument to parseipmask(), use snprint() instead of sprint()

--- a/sys/src/cmd/ndb/dblookup.c

+++ b/sys/src/cmd/ndb/dblookup.c

@@ -1013,7 +1013,7 @@

 {

 	int len, dlen, n;

 	char *dom;

-	char buf[Domlen], ipa[48];

+	char buf[Domlen], ipa[64];

 	char *f[40];

 	uchar net[IPaddrlen], mask[IPaddrlen];

 	Area *s;

@@ -1057,7 +1057,7 @@

 			net[IPv4off+1] = atoi(f[2]);

 			net[IPv4off+2] = atoi(f[1]);

 			net[IPv4off+3] = atoi(f[0]);

-			sprint(ipa, "%I", net);

+			snprint(ipa, sizeof(ipa), "%I", net);

 			t = ndbipinfo(db, "ip", ipa, attribs, 1);

 			if(t == nil)	/* could be a reverse with no forward */

 				continue;

@@ -1066,7 +1066,7 @@

 				ndbfree(t);

 				continue;

 			}

-			parseipmask(mask, nt->val);

+			parseipmask(mask, nt->val, 1);

 			ndbfree(t);

 			n = 5;

 			break;